Wow... The venue almost adds another layer to the movie. You're watching a 1982 vision of 2019, accompanied by live electronic-orchestral music, inside a theater built a couple thousand years ago...
And behind the screen on the horizon, framed in a stone arch, was the lights of the ongoing Elliniko megatower construction project, which already dwarfs every structure in the country. It was another layer onto what you described.
Also Vangelis was pretty much inspired by Byzantine Greek Music which was inspired by Ancient Greek music which was played in the ancient theater 2 millennia ago.